code: def test_cancellation(self):
      sa = SArray(range(1, 10000))
      s = sa.summary(background=True)
      s.cancel()
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  from ..data_structures.sarray import SArray
  import pandas
  import numpy
  import unittest
  import random
  import copy
  import os
  import math
  import array
  import time
  import itertools
  import pytest
label_desc: Use image node_id 13 for calling the SArraySketchTest obj's underlying member method code with example usage: obj.test_cancellation() without return types